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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8bb0221f5f8ac3b6f9da0be66048a33e162f8e6cc2eb0801864c06f35fd332c' 
  AND token = 'XRSWNFulNRRJF/5wSKDfQD8Gyp/ddm1QoNLk4Km/6kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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