SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '761dc153355b60af2326746cb45c8b9b5d0130dd941a29acdb0895119a634484' 
  AND token = '+kTZWngc3lHnKtCCGJzQOAt+B+UpELvNnFUNTmhTFjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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