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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9fe7f536498e94beaa755d9a3a15edb97e6418a7e4d9f3e4d02f474a4fa4026' 
  AND token = 'uvPC4WBKuE2UuMDcNzrt8CCAv0s4RSVxWS3Xx2zn6GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}