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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce80cef64963bd758ecc9479403676046447e6af69c60f3f3a6c5aed61436c7c' 
  AND token = '1i92KmRDXDsy0NO/Jvm/G722PwiUFq/NSLACsyDmoIw=' 
  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"
    }
  }
}