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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60dba584c28d38d0b89a5b3d30ddcea8fc393dd7bdea67228cbf945344e4c902' 
  AND token = 'SPRPg+bLgSPorByGmc6/smlvYFsb7yNrfC+8mwHMZmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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