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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7a555e7e41a48bb1f09dfdc3d6bd5ca3be2f84fd93f10327de0e0a1db3ba441' 
  AND token = 'ZMq+O3yRYGhlakYbJwUWebBhi/ZVRaN/dapb7OvR7dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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