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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '753fd8b415ded1ffa86fdbaef9164793d676425fab23d19b5f8aa2ae2dd3afb0' 
  AND token = 'UfDdFUrODJr6sT7bPIIImqujzqrpG1fxSuT1R4q62Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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