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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4954b60f750d6cc939aaae02b2d79a25a4d0c3ca01776a56cb3595939ba15757' 
  AND token = 'pUvqmw4vN5dzQNvhSlShrKbr25Y+39hsKBPrNsMIe5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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