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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3632e9d004b1f7eaa2008e3c5a1ac9fb073a3d02c25d9fa1ae0e4744b282e89d' 
  AND token = 'nzRaQq+yUOr8IMQ4zYzL77GCSjwQP5ta5tQVtsa27zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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