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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b608711e699ab39871a7393699bd914121982c7736fab1b9b29010f25661f796' 
  AND token = 'WHoHOw/Ty0e5dD3ZrpX0Yre7idO06ll3JbLKGzKHyAs=' 
  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"
    }
  }
}