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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df02c9d1b2ba6bf5e6447b20a4c84e8b750c4a867f9b31c510cfba8d408f6d8d' 
  AND token = '53gNRf02fSAvcYz4mq25DxbmaaC9lK0HQu5ZUmdj3hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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