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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa05201176119680c064a9e4b8b0d1cd845b0f6061fae2eca29d5167286a1f16' 
  AND token = 'QpsOApWntRVEEytQ0ACF8BDOAjlLdfjryBd3tp6w9Aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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