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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3124d63d1f84e22c921a32290bd7b1faccd736c63c6301ceac96a6e9c4d45b30' 
  AND token = 'ipJbt3GNQHBqOwIbcSbun1TaXywDgc80Y7EKff+ytAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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