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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dedd1409318458b4e67f0833fc4c01427feee2de4a8d4c436ed196ae1576d20b' 
  AND token = 'Na4rRuS9mOA84L189+M83kg2zorG17HZ6cJoxlZdYQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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