SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74e68c930279f74c2d659b587f6019435b30f8f08c455ab5ceadd6e9337c0036' 
  AND token = 'MBiSz17TgQl3exI1VJFwk8I4mF4fXIPNwhfZpvYXHUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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