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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ceb77d22e4c79a73e751c78ea38fc12ab9eac044959658f50a1460cf4455eec' 
  AND token = '9JTt4x+fr8HFR9I8RTWpCch9UyQSaTvZf8EdnH958wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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