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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de942a7e5b6b80c7fcae896bdb32ffc7b1bf8870f3baa9aa65007c57f07aa8d2' 
  AND token = 'wTIKN/00gxoI1r+RSICjYp6NJjz5ujuAqAkqcjET22M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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