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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '732951875d1e75ac387410331b046b877c1f519123321ab6da336212301ebec6' 
  AND token = 'wLYZc6JendoiqpnQvwekwX2m0hLqHUyaXVe6K80gCsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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