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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '167a00c448e342d8e0a4dffa8604795e306d28cef756347385720526a28b5b02' 
  AND token = 'AzzmMNz3JElyrIz5P042ISzN3gDYTH8LR4NCJmRyUns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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