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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f960935c8fdb5aaaec0fb3c63965415ff8ec58a144f8581bde68c8840f8193f' 
  AND token = 'WFzWcXt8Nyhr/ce8y2sSvckViVczbZrOcmGoh0CE+ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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