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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f35a77bfe8e005a516392bde6482ae73f971fb8803214e183de7967a996af276' 
  AND token = 'u96w2+UbqatE5AIcEgqJFZSSQbSSq4p3irVA+3acuJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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