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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad9f3c488d1dd8300a514bf8b34c9666ae77fde6e1911e4d63944673a09ca0a6' 
  AND token = 'jOiOjtDSOD+nmWXngcWKd/dFiz6y1ZjyOCP1xpnxS1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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