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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '650eb8ee7cb6a2f68d0343be91390c69b98206d90a3ef397e30d787056bd75d1' 
  AND token = '/CT+LnawdhDL+OaigWf1wH7B8FBkaU+Q5xJAkkIHf5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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