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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34ccd5c60056886cc2c26e72c2704d1dcd58826b358e9a30cf54b778b7ed50ab' 
  AND token = '89t6DOdcutIilq7EISlUiXIhX2U3yDk3XQCC4PLXQq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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