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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5908f17ca0f2ceb822e0f02f78c231a92dd1f15646a4bb7c364531908e90944' 
  AND token = 'cQY4HQI7iyFGMZNv2yNFWZ+6rqE8L5/omBnGL4ZteCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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