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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b623e03675b61b8d88d1edf2a7339172658fcd13a935523b9421cf61bbc1cea9' 
  AND token = 'y/4J6flss6A6x6vnBnCi7Q8YKVOeK6QZnu1tr8xSuzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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