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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed2cd07f8bf034bbe47c22e5c17dff687dc499a91fbc7d4f8944ab4b80e7bc00' 
  AND token = 'ulwWNBJcD3ae+DKZuWc+er0/jZVgN+nLCo0CTAttFoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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