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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '065bac64b482be511f2e279e592c7b82b4e4ee09b36af582af509d63a324cd55' 
  AND token = 'j7Um7y4gTII36FqynqkMi9fSU0K3YhAaQkklHgzp/j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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