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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad41b02a2b01300dd9451c9000e5b62a6e14e9f00be6e34c7d6c84af91d19ce2' 
  AND token = 'akq0plo2i2f4r7c0twjFc9VJ8qqCexQHmHvwW67DtyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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