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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f27ebdc3b54454d7c8e4681226104a2a6ca7a8ebaafe0dd770c57b6e7095b2' 
  AND token = 'B1minDluqIF0JMp/m6392uZoTDGg2Uv/wWxz6TnpCM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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