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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a2f96658a2045abc80cd8c62bb34ebe47744dbf2fd74f6476688c3b0a7857c' 
  AND token = 'LFBmhMfkMuhh3du/+rtiObL/9byiiinPNOZaHi24o0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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