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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '492fccb56ca188b1bb8f57fc09666245adda03cabf5976537adf4ee4c681921d' 
  AND token = '1JRm9F7iRjy9ZJ4Ifq1t16RgcsRLNxrQ575mupG8Jkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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