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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acff747e995c8a304793a628cd7e204187677b6ea3e4de30ea1c49bc84c12b9a' 
  AND token = 'zjQT0r57saHhbO+75dRDEV/HRkejlAtWqGdRoC/p1nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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