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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4a2ea9f8d5881bdbfce1098aa12cb7b6cd8f0bd82c211a3b426de650c21905' 
  AND token = 'U9fzVp8Wc5iqzoYQAp8afq3lO8xWz0fhULXoSL3HP4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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