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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7866121dd9abfb60fa8c9ff52791ff729ce7ca925c44b9eb2cdabea3da2ac870' 
  AND token = 'bjRwH6gp18uKbeLwm7T4BOUnoo3bWcIZYCyKeKENgEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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