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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b2ec07c81a0ee8140fdd7e5fbfd3ef65469bb55479a046c76ef1f5a78022a08' 
  AND token = '4QxJUKvRSHa7Ds1EoGY/a96mZnHCC4KoR15Uib7bNYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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