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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2714a5e33c7de55915dbf1da7e840f702fd5e98ef7385808cd66ef8f436d6702' 
  AND token = 'OEDoG2J8UybMQDtrfDmAH9tWZiSeJk/o3cdrRYDk1O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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