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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9afd677979b8c0c67828d9d7524ccb791171fb31b013e6e8ad82a9b5629734cb' 
  AND token = '9W+wjPyRyUpaMHOH8eIM0W2RADj/L5GyBJLUbqNBHc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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