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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58bb6cecd4b2cf4e90023b42240d4ead52cdf118cbb2ee5a031f178f1862d5fc' 
  AND token = '/jV0X423u8i3y1Wc9gYy0nCAEzogWIcfx+04t9XqKpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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