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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d482d81790197ca34c5bb9fe83b4f08a8bedf78f1cdc912257465ae1b4d366' 
  AND token = 'myH5lqN3OpxcKTmzQPH3Ok3qebDrACIt/6zl7m8ooWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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