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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae8c063c345248750d2980e9347f737d1c4121be3ee231e1580fbe9576621e72' 
  AND token = 'Itk8j8UQktXd0QmKNLT4h4/uNePfLr63UCq8qF4cP6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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