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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70050ab7ff1961308b26f7edac395c974cf24c20a738b54c73da9fe927708d87' 
  AND token = '9NclFLav4mrrrm7ro8zBDpyGVzwix8v2JIfEZl54LJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}