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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '232b98d075141584460d6ff59426bde86119c9915350bd5ba552496c55aa4cb6' 
  AND token = 'wsa5wDO5XRMddfiGh4lGzuN/ISKza+rBByZT2NR0wXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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