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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '545dc7bb91769522acaee9aea322554a07b60fce0dc6a08a41343f23e574f7cc' 
  AND token = '+vTBAJM9g7XWPkVq0Iew60oeM0/L/5enhKD0WCFMX0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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