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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8327b9a33a618e8fadb48da7abc765c4a8ef9f5ab07e8c67e16cebd0e2af8061' 
  AND token = 'BusuXHX1yneJ7Ohk8lD7I2cemi57KXj0kRXNltO+MR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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