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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36be661644b6fbb3267c973ef32e9f5f1e6cc8fbffd5acef1dec7fec6e8aa53' 
  AND token = 'GYN2rbtRILu4kq5IeWUJuL78uWuxV1XSu9v6X0szWs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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