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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e8f96bae7ab4d4e75cc2802464104349d4d2bd5710fb528a496b2b33f07df6e' 
  AND token = '9x3xT99n4DRHIPVsiuauKhC8+UOKkKer9RCc5ADH71k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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