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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b21df61b40a3086a110927ac39c89de8cca7087091053ea093f105e7d581387f' 
  AND token = '5Cxtr0AqrPv2KIqEGzHFUrs9GzO5iv9bWKVXXmk4jOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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