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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad98d0d3149ded49b8d8076fa2616c8ed95973b913d56840b5d88ced6ed27cb3' 
  AND token = 'dEf2Oc+t4gsNw73CKyb0jQvQXbG3sT4GoaabEygGWAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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