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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3c7ae73f24f7b32a90e22ebdf4863ab5884147b57ca4c5e9c5fb87f2b42c510' 
  AND token = '3kS9z59l4HtJY0smRWsCEt/SuwqnA7WD2H8A+ZZUw7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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