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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7102055f6df1abe95505f13c0a492e6344eaf6980e5b199ad80d7c6b0aaa69f7' 
  AND token = 'D357HSTERUkftq8hY9aB4gMc+BU+1opXY7hrVJ6g0bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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