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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5d284c948efa9a726fbd6b43ec308e3863566fa150a13531eeefd7c3010ade0' 
  AND token = 'EVYINkS0PYBjoxTxyfmvUA3rTdS8OlL3MJEczb2UkuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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