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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '211a9df243b5ee3a19a0f2888e1c491dadb2fa517f002e063190a866d1d00b5c' 
  AND token = '6GNe/3QhrFZgstj5WYF+x9QknWjCfNncQiU9Ld+tZgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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