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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '883ed7d6acac426bc73310dc3c803608c9ad2d04c10b984b4846a6122e0fefdd' 
  AND token = 'P00Mdlz9TeDi7B8+YL7m8H1B600LwjWfnNS7yKo6ClU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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