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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8241c5f4520a7fcd1baf6be808780e716b873d422a55229aca2a47626a619dd2' 
  AND token = 'Pg4D2W/k9MKC6uOn99JC5NmtJggcjdCzaMKATgOguDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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