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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46f823378990bd27f7e4e3992627beaa1c0062cf9f20a8a8e520daabd4f71134' 
  AND token = 'Khauv1re4M86vnScCE45Rfq7OUQwcBwX2W9B08LRnVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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